Support for phonograph turntables



Nov. 6, 1934. w. A; SCHM IT'I 'GE N SUPPOR'I FOR PHONOGRAPH TURNTABLES Filed Feb. 4, 1931 AE A A A 10/1/11) INVENTOR.

William A. fichmifl gen Patented Nov. 6, 1934 I o v UNITED jsTA-rss ,PATENT, OFFICE sUPPon'r roa Pn'oNoGn Pn TURNTABLES' William A. Schmittgen, Elyria, Ohio, assignor' to v The General Industries Company, Elyria, Ohio, p a corporation of Ohio i Appumioa February 4, 1931, Serial N... 513,361 4 Claims. (Cl. 374-39) This invention relates to phonograph mechanisms and particularly tosupports for the turntables thereof.

- It has heretofore been generally customary to 6 drive the horizontally disposed, turntable of a phonograph by a vertically disposed shaft rotatably driven by a motor mechanism, and to rigidly connect the turntable to the shaft and in direct contact-therewith. An important disadvantage of this arrangement is that vibrations of the rotating shaft created therein by vibrations in the motor mechanism driving the shaft, are transmitted from the shaft to the turntable and thence are transmitted to the record on the turntable. During the operation of the phonograph, the sound reproduction is to a greater or lesser degree marred by these vibrations in .the record. 7 It is one of the objects of this invention to provide a support for phonograph turntables whereby rotating power may be transmitted thereto free from vibration.

It is another object to provide a support for phonograph turntables in which vibrations ofthe driving shaft may be absorbed before reaching the turntabledriven by the shaft. 7

Another objectis to provide an improved means for "transmitting. power from r the rotating shaft of a phonograph turntable driving'mechanism, to I the turntable to drive it, and whereby the turnable may be supported" upon the driving shaft in a manner to render it free from vibrations in the shaft.

Fig. 1 is a cross-sectional view of a phonograph turntabl'e, illustrating in simplified form a drivsandwith the'view rotated through 90",; so modiflcation. 'r-

ing mechanism and shaft, and illustrating an embodiment of my invention;

Fig.'2 is a view to an enlarged .scale of a part oi! Fig. 1; I v

Fig. 3 is a view taken approximately from- .the plane 3 of Fig. 1, to an enlarged scale and illustrating only the turntable driving shaft and'a clutch or driving element which I may employ;

Fig. 4 is a; view taken-from the plane a" of Fig.

Fig, ,5. is; a view} similar. to. V 2, showing a Ref err-ing; to thed'rawin g,

aph drivingf 'l'oto 1 way. I

as projecting upwardly out of the housing 1. A

pin --3.extends diametrically through the shaft above the housing 1. Ametal clutch device or washer 4 restsupon the pin 3, the perforation 22 in the washer being larger than the shaft 2, and the washer at diametrically opposite portions thereof where it rests'upon the pin 3 is provided with pairs of downwardly projecting lugs 5-5 on opposite sides'of the pin'3. Thus the lugs provide two notches, which embrace "opposite end portions of the pin 3. The lugs 5 are preferably pressed out of the metal of the main body portion of the washer 4, as plainly illustrated in the drawing.

Secured to the upper side of the washer 4, in any preferred manner, as for example, by the use of an adhesive, is a cushioning'washer 6 of rubber or like material. The washer 6 is preferably of the same diameter as'the washer 4 and the perforation 7 at the center thereof preferably snugly fits the shaft 2. I

The turntable j comprises a horizontal. body portion 8 at the center of which is a downwardly l ;'extending hub 9 provided with a bore 10. The

lower face 11 of the hub 9 rests upon the'upper surface of the washer 6; and the bore. 10 surrounds the upper end of the shaft 2. 'The tummay project upwardly through a'prforation 13 in the felt as at 14, and .upon the end'14 the phonograph recordmay be centered in the usual In the operation of the form of my invention shown in Figs. 1 to 4, the pin rotating with the shaft 2 drives the washer 4 by means of the lugs 5-, which in turn drive the washer 6. The frictional engagement of the face 11 of the hub 9 with the upper surface of the washer 6 drives the turntable. All vibration transmitted longitudinally ofthe shaft 2 is absorbed by the cushioning washer 6 and not transmitted to the turntable. Preferably, the bore 10 is larger than the through the .closely fitting aperture '7 andtherefore not transmitted to the hub '9.

In the formaof my invention showninFig. 5,

v a diflerent form of cushioning orivibrationl absorbing washer-11s employed; This washer is illusg or flat horizontal portionitflf and. aasle'eve -18 eralLv at 1.'a;housin'gwithin extending upwardly from; the up per surface r-thereof and coaxial therewith. 'lnthisiform also,

thebore in the hub 9,:- as; ,at"'19, is conis I . 106 trated at 16 in -Fig., 5 and comprises a planular siderably larger than the diameter of the shaft 2 and the sleeve 18 projects axially into this bore 19. The bore at its lower end, as shown at 20, is slightly enlarged to facilitate assembling of the turntable hub 9 on the sleeve 18 by a downward movement of the hub over the sleeve.

In the operation of this form of my invention, longitudinal vibrations of the shaft 2 are absorbed in the horizontal portion 17 of the washer 16 and are not transmitted into the hub 9. Also, radial or lateral vibrations in the shaft 2 are absorbed in the 'sleeve 18 and prevented from being transmitted to the hub 9. Thus all vibration from the shaft 2 is absorbed in the portions of the washer 16 and not transmitted there beyond.

My invention is not limited to the exact details of construction shown and described hereinbefore. Many changes and modifications may be made therein without departing from the spirit of my invention or sacrificing its advantages.

Iclaim:

1. In combination with the vertically disposed driving shaft of a phonograph turntable motor and a turntable having a downwardly projecting hub, a support on the shaft for the turntable comprising a transverse pin extending through the shaft, a metal washer resting on the pin and provided with pin-engageable driving lugs, a cushioning washer on the pin-driven washer upon which the hub of the phonograph turntable is adapted to rest in driving friction engagement therewith.

2. In combination with the vertically disposed driving shaft of a phonograph turntable motor and a turntable having a downwardly projecting hub, a support on the shaft for the turntable comprising a transverse pin extending through the shaft, a metal washer resting on the pin and provided with pin-engageable driving lugs, a cushioning washer on the pin-driven washer upon which the hub of the phonograph turntable is adapted to rest in driving friction engagement therewith, the shaft extending through a perforation in the cushioning washer in engagement with the inner periphery thereof and extending through a perforation in the hub with clearance.

3. In combination with the vertically disposed driving shaft of a phonograph turntable motor and a turntablehaving a. downwardly projecting hub, a support on the shaft for the turntable comprising a collar secured to the shaft transversely thereof, a, horizontally disposed washer resting on the collar, an upwardly extending coaxial sleeve associated with the washer, the Washer and sleeve being composed of cushioning material, the bore of the hub enclosing the sleeve and the hub resting on the upper surface of the washer, and the shaft projecting upwardly through the washer and sleeve.

4. In combination with the vertically disposed driving shaft of a phonograph turntable motor and a turntable having a downwardly projecting hub, a support on the shaft for the turntable comprising a pin extending transversely through the shaft, a metal washer resting on the pin transversely of the shaft and provided with downwardly extending lugs drivingly engaging the pin, a washer of cushioning material resting on the metal washer, an upwardly extending sleeve of cushioning material on the washer coaxial therewith, the shaft extending upwardly through a perforation in the metal washer and through the cushioning sleeve, the hub being provided with a bore large enough to embrace the sleeve and the lower end of the hub resting on the cushioning washer.

WILLIAM A. SCHMITTGEN. 

